Effects of extraordinary floods on the dynamics of tall grasslands of the river Parana valley

Lewis, Juan Pablo; Franceschi, E. A.; Prado, Darién E.

doi:10.1127/phyto/15/1987/235

Cited by 16 publications

(20 citation statements)

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“…Excetuando-se essas, verifica-se que Evolvulus sp, Justicia comata, Prestonia dusenii e Vigna unguiculata encontram-se listadas apenas no presente estudo. Os trabalhos consultados para essa comparação incluíram áreas ripárias do rio Paraná, em território brasileiro (Mantovani e Catharino, 1994;CORIPA, 1996;Campos, 1997;Souza, 1998;Thomaz et al, 1999;Fachini, 2001;Tanaka, 2001), em território paraguaio (Marmori, 1995;Vega, 1997) e em território argentino (Cabrera e Fabris, 1948;Burkart, 1952Burkart, e 1957Lewis e Franceschi, 1979;Franceschi et al, 1985;Lewis et al, 1987); dos rios Ivaí (Mikich e Silva, 2001), Grande (Pedralli et al, 1993a;Stranghetti e Ranga, 1998), Uruguai (Di Persia e e Amazonas (Junk e Furch, 1980;Albuquerque, 1981;Junk, 1986); da bacia do rio Doce (Pedralli et al, 1993b), do Pantanal (Pott et al, 1986(Pott et al, , 1989(Pott et al, , 1992(Pott et al, , 1999(Pott et al, , 2000Prado et al, 1994;Silva et al, 1997;Heckman, 1998) e no Rio Grande do Sul (Flores e Winkler, 1979;Irgang et al,1984;Pedralli et al, 1987;Oliveira et al, 1988;Irgang e Gastal Júnior, 1996;Gastal Júnior e Irgang, 1997;Rosa e Irgang, 1998).…”

Section: Resultsunclassified

Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil

Kita¹,

Souza²

2003

Acta Sci. Biol. Sci.

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'56''W), empregando-se levantamentos florísticos e perfis fitofisionômicos em diferentes períodos fluviométricos, além de uma carta batimétrica e análise do solo. O levantamento florístico resultou no reconhecimento de 36 famílias, 75 gêneros e 89 espécies. As famílias de maior riqueza específica foram Poaceae (14 espécies), seguida por Cyperaceae e Euphorbiaceae (oito cada). O porte predominante pertenceu ao herbáceo (79,78% das espécies) e, quanto à forma biológica, houve predominância das terrestres (50,56%) e das anfíbias (37,08%). A fitofisionomia, com predominância de herbáceas, apresenta diferenciações entre as margens e ao longo da lagoa, havendo uma considerável diminuição da cobertura vegetal no período de águas altas. Essa lagoa foi considerada um corpo de água raso, com solo tipo argiloso. '56'' W) has been carried out using floristic surveys and phytophysiognomic profiles, in different water periods, together with a bathymetric chart and a soil analysis. The floristic survey resulted in 36 families, 75 genera and 89 species. The families with more specific richness were Poaceae (14 species), followed by Cyperaceae and Euphorbiaceae (eight each). The highest habit incidence belonged to the herbaceous (79,78% of the species) and, concerning the biological form, there was predominance of the terrestrial (50,56%) and amphibious ones (37,08%). The phytophysiognomy, with predominance of herbaceous, shows differentiation between the banks and along the pond, with a considerable decrease of the vegetal covering in the high water periods. This pond was considered a shallow body of water, with loamy soil.

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Section: Resultsunclassified

Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil

Kita¹,

Souza²

2003

Acta Sci. Biol. Sci.

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“…Topographic, edaphic, and age factors define different forest types on islands, but islands in general tend to have fewer tree species than inland forests (Daly and Prance 1989;Daly and Mitchell 2000). A high proportion of trees (40-60%) and animals die during these extraordinary floods and in general all plant communities of the islands are destroyed, but after a few years the physiognomy of the forest and animal populations recover (Lewis et al 1987;Neiff et al 2000). During ENSO events, the islands of the Parana´and Paraguay Rivers suffer extraordinary floods.…”

Section: Study Sitementioning

confidence: 99%

The impact of seed dispersal by black and gold howler monkeys on forest regeneration

Bravo

2011

Ecological Research

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In Neotropical humid forest, the majority of tree species have seeds dispersed by vertebrates. Seed deposition by vertebrates is often spatially aggregated and a low per capita survival for seeds and seedlings is predicted. However, mortality factors could be saturated by high densities. I evaluated whether recruitment of saplings of species dispersed by black and gold howlers (Alouatta caraya) in latrines is higher than at control sites: (1) below parent trees, (2) in trees not used by monkeys to sleep, (3) randomly chosen sites within the forest, and determined whether howlers may influence current floristic composition of the Paraná River flooded forest. I recorded saplings several years old in the territories of five monkey groups. In total, I found four times more saplings in latrines than in the other areas, and results suggest that latrines are recruitment foci for most species, though larger samples would be required to assess this for every species. Frequency distribution of the diameter of tallest saplings of more abundant species reflected recruitment over time. I found saplings of more species growing in latrines than outside of them. Saplings higher than 1 m of two species of laurels (Ocotea diospyrifolia and Nectandra megapotamica) and one species of Myrtaceae (Eugenia punicifolia) had higher densities in latrines than below parent trees. Results suggest that mortality factors were saturated in latrines and that sapling may grow at a higher rate in latrines. In relation to the influence on floristic composition E. burkartiana, an uncommon species in the forest, could increase in abundance as consequence of seed dispersal by howlers.

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“…Third, we examined temporal differences in longitudinal diversity along the riparian corridor. Extreme events, such as large floods, may affect the entire river and adjoining areas and may cause widespread extinction of plant populations, depending on the timing and magnitude (Lewis et al. , 1987; Stromberg, 1993; Smith et al.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of species richness in a riparian landscape

Renöfält

Nilsson

Jansson

2005

Journal of Biogeography

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Aim To test for control of vascular plant species richness in the riparian corridor by exploring three contrasting (although not mutually exclusive) hypotheses: (1) longitudinal patterns in riparian plant species richness are governed by local, river-related processes independent of the regional species richness, (2) riparian plant species richness is controlled by dispersal along the river (longitudinal control), and (3) the variation in riparian plant species richness mirrors variation in regional richness (lateral control).Location The riparian zones of the free-flowing Vindel River and its surrounding river valley, northern Sweden.Methods We used data from three surveys, undertaken at 10-year intervals, of riparian reaches (200-m stretches of riverbank) spanning the entire river. In addition, we surveyed species richness of vascular plants in the uplands adjacent to the river in 3.75-km 2 large plots along the same regional gradient. We explored the relationship between riparian and upland flora, and various environmental variables. We also evaluated temporal variation in downstream patterns of the riparian flora. ResultsOur results suggest that local species richness in boreal rivers is mainly a result of local, river-related processes and dispersal along the corridor. The strongest correlation between species richness and the environment was a negative one between species number and soil pH, but pH varied within a narrow range. We did not find evidence for a correlation between species richness on regional and local scales. We found that the local patterns of species richness for naturally occurring vascular plants were temporally variable, probably in response to large-scale disturbance caused by extreme floods. Most previous studies have found a unimodal pattern of species richness with peaks in the middle reaches of a river. In contrast, on two of three occasions corresponding to major flooding events, we found that the distribution of species richness of naturally occurring vascular plants resembled that of regional diversity: a monotonic decrease from headwater to coast. We also found high floristic similarity between the riparian corridor and the surrounding landscape.Main conclusions These results suggest that local processes control patterns of riparian species richness, but that species composition is also highly dependent on the regional species pool. We argue that inter-annual variation in flood disturbance is probably the most important factor producing temporal variability of longitudinal species richness patterns.

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Effects of extraordinary floods on the dynamics of tall grasslands of the river Parana valley

Cited by 16 publications

References 0 publications

Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil

Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil

The impact of seed dispersal by black and gold howler monkeys on forest regeneration

Spatial and temporal patterns of species richness in a riparian landscape

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